Wrapping machines



1957 c. B. BENNETT 2,817,938

WRAPPING MACHINES Original Filed Dec. 15, 1950 5 Sheets-Sheet 1 A IINVENTOR 4 62/15020 B Bewzverr ATTORNEYS Dec. 31, 1957 c. B. BENNETT2,817,938

WRAPPING MACHINES Original Filed Dec. 15, 1950 5 Sheets-Sheet 2ATTORNEYS Dec. 31, 1957 c. B. BENNETT 2,817,938

WRAPPING MACHINES Original Filed Dec. 15. 1950 3 Sheets-Sheet 3 BY MYMATTORNEY5 WRAPPING MACHINES Clifford B. Bennett, Atlanta, Ga., assignorto Southern Saw Service, Inc., Atlanta, Ga., a corporation of GeorgiaContinuation of application Serial No. 201,049, December 15, 1950. Thisapplication September 16, 1954, Serial No. 456,566

6 Claims. (Cl. 53-204) This invention relates to wrapping machines andhas particular reference to a greatly improved and simplified machineespecially designed for wrapping endless bands, such as band-saw bladesand the like.

One of the objects of the invention is to provide a greatly simplifiedmachine for applying and folding a wrapping strip about an endless bandor band-saw blade to'protect the teeth of the blade during shipment andto prevent it from rusting or becoming soiled before it is used.

Another object of the invention is to provide an improved machine, asabove characterized, having simplified folding means for applying awrapping strip to a band-saw blade while it is suspended and fed throughthe machine by traction rolls.

Another object of the invention is to provide a wrapping machine, asabove characterized, having means for forming longitudinal creases in awrapping strip to facilitate folding the marginal flanges of the stripabout a blade.

Still another object of the invention is to provide a machine, as abovecharacterized, which is simple and rugged in construction, veryefficient in operation and can be controlled by a single operator.

Other objects and advantages of the invention will appear in thespecification, when considered in COlJHflC'r tion with the accompanyingdrawings, wherein:

Fig. 1 is a perspective view of a machine embodying the invention;

Fig. 2 is a fragmentary perspective view of parts of the machine shownin Fig. 1;

Fig. 3 isanother fragmentary perspective view showing folding meansemployed in the machine;

Fig. 4 is a fragmentary side elevation showing the folding mechanism inits operative position;

Fig. 5 is a fragmentary side elevation of the machine shown in Fig. 1,parts being omitted for the sake of clarity, and

Fig. 6 is a fragmentary plan view showing the manner of folding awrapping strip about a blade.

This application is a continuation of my prior application Serial No.201,049, filed December 15, 1950, and now abandoned.

Referring more particularly to the drawings, the ma chine isparticularly designed for applying paper wrapping strips about band-sawblades used in the meat cutting industry. Such blades are usually curledup or folded two or more times into small convolutions and shipped tothe users in bags or containers to prevent their teeth from coming incontact with each other.

folding opposite marginal edges around the side edges of. the blade inoverlapping relation on one side and the wrapping strip will remain inits folded condition to protect the blades until they reach theirdestination, thereby avoiding the necessity of using separatecontainers.

In the The machine automatically applies wrapping strips to the bladesby upper traction roll 13.

illustrated embodiment of the invention, the mag a I 2,817,988 IcePatented Dec. 31, 1957 chine is shown as having a supporting frame 10,conveniently made of structural angles or the like, carry ng horizontalmembers 11 at the top which support traction rolls 12 and 13, preferablymade of vulcanized rubber or like resilient material, for gripping andfeeding a blade B through the machine. The traction rolls are adapted tobe driven by a motor 14 mounted on a shelf 15 below the top framemembers 11. The motor is shown as having a V-belt 16 trained over apulley 17 mounted on a shaft 18 carried by bearings on intermediateframe members 19 which support the shelf 15. A small driving pulley 20is loosely mounted on the shaft 18 and is adapted to be clutched to thehub of the driving pulley 17 by means of a clutch lever 21 and clutchmechan sm, well known to those skilled in the art. A V-belt 22 drives apulley 23 on a shaft 24 extending across the upper frame members 11 andcarrying the bottom traction roll 12. A friction disc 25 is shown asbeing mounted on the shaft 24, adjacent to the pulley 23, and coactswith a similar friction disc 26 on a shaft 27 which carries the A handwheel 28 is mounted on the inner end of the shaft 27 to enable theoperator to thread a new blade and the leading end of the wrapping stripbetween the rolls before the machine is started.

The shaft 27, carrying the upper traction roll 13 and friction disc .26,is shown as being mounted in a single bearing 29 carried on the upperend of an arm 30 which is pivotally connected at 31 to brackets 32 onthe upper frame member 11. The upper traction roll is adapted to beraised mechanically to disengage it from a wrapped blade and permit apaper strip and a new blade to be threaded into the machine. For thatpurpose, there is shown a cam member 33 mounted on a shaft 34 supportedin bearings 35 below the arm 30 and a hand lever 36 is connected to theshaft 34 to operate the cam and bring its high part into engagement withthe bottom of the arm 30 to lift and support the upper traction roll inits raised position, as shown in Figs. 1 and 2.

A roll of paper 37 is shown as being carried by a reel 38 mounted on ashaft 39 journaled in bearings on the lower horizontal frame members 19.The reel has a removable face plate or flange 40 to permit a new roll ofpaper to be inserted on the shaft. A retarding leaf spring 41 is shownas being connected to one of the frame members 19 and frictionallyengaging the rear flange of the reel 38 to prevent it from spinningfreely.

As shown in Fig. 1, the paper strip is threaded in the machine ready tobe applied to a band-saw blade. It first passes over a channel-shapedguiding roll 42 carried by the frame. Then, the strip is threaded arounda channel-shaped creasing roll 43 on which parallel creases 44 areformed on opposite sides of the strip by means of a coacting creasingroll 45 having sharp flanges 46 which engage the upper face of the paperstrip and force it into the channel-shaped roll 43 to makethe creases.The creasing roll 45 is shown as being mounted on an arm 47 pivoted to abracket 48 on one leg of the frame, the arrangement being such that thecreasing roll may be swung outwardly away from the coacting roll 43 topermit the paper strip to be initially threaded therebetween. Thecreasing roll 45 is also shown as having a U-shaped handle 49 to enableit to be lifted manually out of engagement with the creasing roll 43. Tohold the roll 45 in creasing engagement with the roll 43. there is showna coil spring 50 connecting the cross bar of the handle to a stationaryframe member or brace 51. The creased paper strip is shown as passingover a channel-shaped guide roll 52 mounted on a shaft 53 carried by aslotted arm 54 adjustably secured to a bracket on one of the uppermembers 11 of the supporting frame, as shown in Fig: 1.

The band-saw blade B is shown, in Fig. 1, as being suspended from theguide roll- 52' and the lower traction pivoted arm 56 at the right handend of the machine, to-

guide it over the central part of the channehshaped' guide roll 52between the creases 44 formed in the paper strip, whereby the oppositeside edges of the strip may be folded. over the upper side of the bladein overlapped relation. To insure that the blade is fed over the guideroll 52 in this manner, there is shown an adjustable guide plate 57carried by a shaft 58 mounted in a bearing 59 on the upper end of anadjustable arm 60. The arrangement is such that the guide plate 57contacts the smooth back edge of the blade and prevents it from wobblingon the guide roll 52.

The paper strip and the saw blade are then threaded, by hand, throughthe folding mechanism to fold the opposite creased edges of the stripover the top of the blade. As shown in Figs. 3 and 4, the foldingmembers are shown as comprising opposed arms 61 and 62 pivoted at63 and64, respectively, on a downwardly extending bracket or plate 65. The arm61 is shown as carrying a folding member 66 made of hardwood and havinga narrow, U-shaped gap or slot- 67 through which the toothed side of thesaw blade is fed, with the teeth on the blade pointing rearwardly. Thearm 62- isshown as having a V-shaped gap or slot: 68 which isadapted tobe swung into engagement with the smooth rear edge of the saw blade withits bill overlapping the open end of the folding member 66. Thearrangement is suchthat, when the two members are thus moved intofolding position straddling opposite edges ofthe blade, their foldingsurfaces will fold the marginal side edges of the paper strip over thetop of the saw blade. The folding member 66 will fold both creased edgesor flanges of the paper strip over the upper side of the blade; whilethe other member 68 will flatten the folded-under flangeof the paperstrip, accentuating the crease over the smooth back edge of the blade.

When the machine is to be operated at high speed, it is preferred toform. the preliminary folds. and to thread the paper and bladein themachine so that. the folding member 66 receives the corresponding edgeor flange of the paper strip and causes it during running. to be laiddown upon the upper side of theblade; and sothat the other edgeor flange.of the paper strip. passes over the upper part of the folding member 66and is guided downward by the upper wall of the gap or slot 68 in thearm 62.

The two folding members or guides 66 and 68 are held in their activefolding position, asashown in Fig. 4, by means of a tension spring 69connected to the arms 61 and 62 near their upper ends. The arms havedepending handles or levers 70 to permit them to be manually openedseparately or simultaneously, when it is necessary to adjust the foldededges of the wrapping strip. Obviously, one of the folding members maybe stationary, and the other may be movable to release or engage theblade and paper strip. However, the arms are adapted to be openedsimultaneously and both folding members held open by means of a cammember 80 positioned between the arms on a shaft 81 journaled in thebracket plate 65 and adapted to be manually rotated a quarter turn topry the arms apart, as shown in Fig. 3. In this position, the cam.member will hold the arms open to permit the wrapping strip and blade tobe adjusted in the machine without requiring the. operator to use onehand onthe handles 70.

The wrapping strip andibladeare adaptedto besuppotted onarledge or plate83 mounted onqa supporting bracket 84 which also carries thedepending-x'plate or bracket. The supportingplate is shown as havingspaced guiding lugs 85 between which the wrapped'bladc is guided intocontact with the upper surface of the traction roll' 12;

When the wrapping strip is first threaded through the machine and ablade is inserted in place, it will be understood that the uppertraction roll 13 will be raised to the position shown in Figs. 1 and.2;. the folding members will be opened, as. shown in Fig. 3; and themovable creasing roll 45 will be manually lifted to permit the free endof the paper strip to be pulled ofl the roll, 37 and.

guided into.- its wrapping position. over the guide roll 52 between theopening folding members 66 and 68, and between the guiding lugs orshoulders over the traction' roll 12. Then, the saw blade is placed ontop of the creased wrapping strip and suspendedover the guide roll 55,also resting on the guide roll 52, the supporting ledge 83, and thetraction roll 12. When the strip and blade are in this position, theoperator folds over the flanged edges. E of. the free end. of thewrapping strip at the. creases adjacent to the two folding members 66and 68. Then, he turns the handle 82 of the cam 80, permitting thefolding members to close on the foldedover free edges. Then, the camlever 56 is operated to lower the upper traction roll into grippingengagement I with the naked saw blade and the hand wheel 28 on the.upper roll. shaft is turned to pull the blade and the folded.

wrapping strip into gripped engagement. with both rolls, in whichcondition the initially wrapped blade is adapted to be fed through themachine automatically by the driving motor 14. The clutch lever 21 isthen shifted to engage the driving pulley 20 with the pulley 17 todrive.

the. rolls andpull the rest of the blade through. the ma? chine.

To prevent the saw blade from whipping out of en gagement with the guideroller 52, as it approaches the folding members, there is shown ahold-down or tensioning roller 86 journaled on an upstanding arm 87which is pivotally mounted on a bearing member 88 secured to the topframe member 11. The arm is adapted tov be swung rearwardly, as shown inFig. 5, to bring the roller into contact with the naked upper surface ofthe blade adjacent to the guide roller 52. The roller 86 is narrowerthan the spacing between the end flanges of the guide roller 52, andpreferably is of the same width as the separation of the creases 44 onthe paper strip, i. e.,, essentially of the width of the blade; and whenin operating position, the roller 86 depresses the part of the blade andthe paper strip between the guide roller 52 and the folding members 66and 68 for producing a partially folding of the margins of the paperstrip into a channel-like form in the base of which is positioned theblade, so that the folding members 66 and 68 then act upon the thusfolded edges of the strip. That is, the forming of the channel in thepaper strip is being accomplished while the-strip and blade are beingbent downward or re-entrantly relative to the general shape of theendless saw blade as it is moving in its orbit. In order to-raise thishold-down roll'er out of engagement withv a wrapped blade and permit theblade to beremoved from the machine, it is shown as being adapted to belifted simultaneously with the upper traction roll 13. For that purpose,there is shown a link 89 connected to a bracket arm 90 mounted on thebearing member 29 which carries the shaft 27 on which the upper tractionroll is mounted. The other end of the link is connected to a crank arm91 on ashaft 92 which carries the pivoted arm 87. The. lengths of the.arms 90 and 91 are such that, when the traction roll 13 is raised to itsuppermost position, the hold-down or tensioning roll 86 will be swungupwardly to itsblade-releasing position, thereby permitting a. fully,wrapped blade to be removed and a new blade to. be insertedinthemachine, without requiring separate manual operations to lift both,rolls.

From the. foregoing description, it will. be noted that the bladewill befed. through. the machine and: wrapped automatically by the coactingfolding; members 66 and. The operator merely cuts off the paper wrappingstrip with a knife or scissors at a point between the creasing rolls 43,45, and the guiding roller 52, thereby leaving a free end of the stripto be grasped by hand and again threaded in between the opened foldingmembers 66, 68, ready for another blade to be placed in position on themachine, as hereinbefore described. The operator observes the positionof the leading end of the wrapped strip, stops the machine by operatingthe clutch lever, and cuts off the strip at a point which insures thatthe entire blade will be fully wrapped, with the trailing end of thestrip slightly overlapping the leading end. Then, he turns the tractionrolls by the hand wheel 28 to fold up the trailing end of the Wrappingstrip. The blade is then removed from the machine and folded up, readyfor storage and subsequent shipment.

From the foregoing description, it will be apparent that the machine isvery simple in its construction and can easily be operated by a singleworkman. The margins of the paper strip are brought into overlappingposition at the outside of the blade and are so held as the bladetravels in its closed orbit for the reason that each margin would haveto increase in length to unfold. The overlapping margins of the wrappingstrip closely engage the surface of the blade and do not tend to becomeunfolded during the manipulation of the blade to fold it into smallconvolutions. The wrapped blades are fully protected from moisture,which would cause rusting, and the teeth are shielded by the wrapper sothat they will not rub against the teeth of other blades duringtransportation. The wrapper can easily be stripped off the blades at theplace of use.

Obviously, the invention is not restricted to the particular embodimentthereof herein shown and described.

What is claimed is: 4

1. In a machine for applying a wrapping strip longitudinally about aband-saw blade or the like, a supporting frame adapted to suspend thesaw blade vertically; a pair of relatively movable traction rollsmounted one above the other for supporting and pulling the blade throughthe machine; means for supplying a wrapping strip longitudinally of theblade to engage one face thereof; a pair of coacting folding membersspaced from said traction rolls and located opposite each other onopposite sides of the path of travel of the blade and strip and eachhaving a horizontal strip folding recess coacting to form a passagewayadapted to receive the blade and strip and presenting surfaces adaptedto simultaneously engage and fold the opposite edges of the strip overthe opposite side edges of the blade; at least one of said foldingmembers being separately movable substantially horizontally toward andaway from the path of travel of the blade to permit the blade and stripto be inserted between said members and removed from the machine; andpower operated means connected to drive the traction rolls.

2. In a wrapping machine, as set forth in claim 1, wherein the foldingmembers are carried by a pair of arms pivotally mounted with respect tosaid frame and are adapted to be opened to permit insertion and removalof the blade and strip; and manually operable cam means coacting withsaid arms to open said members and hold them open.

3. In a wrapping machine, as set forth in claim 1, wherein achannel-shaped guide roller is mounted on the frame rearwardly of saidfolding members to guide the strip with the blade thereon to saidfolding members; a movable hold-down roller mounted on the frame forholding the blade in engagement with the strip on said guide roller; andmeans connecting said hold-down roller to the movable traction rollerwhereby said hold-down roller will be moved out of engagement with theblade when the traction rolls are opened.

4. In a machine for applying a wrapping strip longitudinally about aband saw blade or the like, a supporting frame; a pair of relativelymovable traction rolls supported by the frame for engaging and pullingthe blade through the machine; means for applying a wrapping striplongitudinally of the blade and into engagement with one face thereof; afirst guide roller for supporting the wrapping strip adjacent itsengagement with the blade, a second guide roller of essentially thewidth of the blade to engage the blade between the first guide rollerand the traction rolls; folding means on the frame for causing marginaledges of the paper strip to be folded over the edges of the blade andlocated between the said guide rollers and the traction rolls; means forrotatably mounting the guide rollers on the frame including means formoving the second guide roller from an inoperative position out ofengagement with the blade to an operative position in engagement withthe blade, with the second roller so positioned that when in operativeposition it is effective to cause the blade to move in a downwardlyconvex path between the first guide roller and the said folding means,and to cause the strip to be partially folded to a channel 'shape withthe blade therein; and power operated means connected to drive thetraction rolls for pulling the blade and strip through the machine.

5. In a wrapping machine as set forth in claim 4, ineluding a pair ofcoacting creasing rolls rotatably mounted on the frame and positioned toengage the Wrapping strip before it engages said first guide roller andform two spaced longitudinal creases therein about which the oppositemargins of the strip are adapted to be folded.

6. In a machine for applying a wrapping strip about a band saw blade orthe like, a supporting frame; a pair of relatively movable tractionrolls supported by the frame for engaging and pulling the blade throughthe machine; a reel mounted on the frame for rotation about a horizontalaxis and adapted to carry a roll of the wrapping strip; a pair ofcoacting creasing rolls rotatably mounted on the frame and positioned toengage the wrapping strip to form two spaced longitudinal creasestherein about which the opposite margins of the strip are adapted to befolded; and a channel shaped guide roll mounted on the frame forrotation about a horizontal axis and positioned to guide the strip andblade with the blade flatwise on the strip between the creases; foldingmeans mounted on the frame and positioned between said traction rollersand said guide roll for causing the marginal parts of the wrapping stripto be folded over the edges of the blade; a movable hold down rollermounted on the frame for holding the blade in engagement with the stripon said channel shaped guide roll; means connecting said hold downroller to the movable traction roll whereby said hold down roller willbe moved out of engagement with the blade when the traction rolls areopen; and power operated means connected to drive the traction rolls topull said blade and wrapping strip through the machine.

References Cited in the file of this patent UNITED STATES PATENTS2,276,282 Bindszus Mar. 17, 1942 2,298,363 Ganz Oct. 13, 1942 2,458,971Wilson Jan. 11, 1949 FOREIGN PATENTS 327,229 Great Britain Apr. 3, 1930

